The actress, who recently split from "Ghost Whisperer" costar Jamie Kennedy, says she has been cheated on "a lot" in her life.

"It's brutal," she told Ryan Seacrest on his KIIS FM radio show Tuesday. "Once I found out on television and that was awesome. And then another time I found them together ... and that was, woooo!"

She says she walked in on the unnamed duo together and knew the girl.

"That was not good," she says, adding that she also found out another beau was cheating because she "had a feeling" and then "found phone stuff."

Luckily, "The Day I Shot Cupid" author, 31, said Kennedy taught her the most about relationships -- she even dedicated the book to him prior to their split.

"We are sort of opposites," she says. "I am sort of this gushy hopeless romantic and he is sort of this realist. So, he really taught me how to look at the reality of things like love whereas I had my head in the clouds before. He very much taught me some things and he taught me a lot about men and what they think."

Hewitt jokes that she won't seek out famous men like past flames -- which included Joey Lawrence, Carson Daly and John Mayer -- but admits that she doesn't date them "on purpose."

"I don't seek them out," she says. "I am starting to think maybe that's not the way to go."